/*
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 * and open the template in the editor.
 */

package demo05;

/**
 *
 * @author Administrator
 */
public class CheckID {
         public static void main(String[] args) {
        String ID ="4521219931218641X";
        boolean flag = true;
        if(ID.length()!=18){
            flag=false;
        }
        if(!(ID.startsWith("452")||ID.startsWith("455"))){
             flag =false;        
     }
        String numstr ="0123456789";
        for(int i = 0;i<ID.length();i++){
            char c=ID.charAt(i);
            int temp =numstr.indexOf(c);
            if(temp<0){
                flag=false;
                break;
            }
        }
        if(flag){
            System.out.println("是合法的身份证号码");
        }
        else{
            System.out.println("不是合法的身份证号码");
        }
    }
}

    

